Other Long-term Liabilities - Schedule of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Deferred rent liability	$ 906	$ 785
Leasehold improvements financing and other (see a and b below)	193	254
Unrecognized tax benefits	2,400	1,565	$ 308	$ 549
Other	534	131
Other long-term liabilities	$ 4,033	$ 2,735